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Financial instruments - Hedge accounting (Details) - Currency risk $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 ARS ($) tranche | Dec. 31, 2017 USD ($) $ / item | Dec. 31, 2017 ARS ($) | Dec. 31, 2017 ARS ($) $ / item | Sep. 15, 2017 USD ($) | Jun. 30, 2017 ARS ($) $ / item | Mar. 31, 2017 USD ($) | Mar. 15, 2017 USD ($)
Fair value hedges | Other comprehensive results |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Receivables recognized |  |  |  | $ 4.0 |  |  |  |
Receivables recognized, Current |  |  |  | 2.0 |  |  |  |
Receivables recognized, Non-current |  |  |  | 2.0 |  |  |  |
Fair value hedges | Foreign currency exchange rate gains |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Receivables recognized |  |  |  | 6.0 |  |  |  |
Gains recognized from receivables |  |  | $ 6.0 |  |  |  |  |
NDF | Fair value hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount | $ 40.0 |  |  |  | $ 100.0 |  | $ 400.0 | $ 300.0
Number of Tranches | tranche | 2 |  |  |  |  |  |  |
Liability of hedging instruments |  |  |  | 17.0 |  |  |  |
Current liability of hedging instrument |  |  |  | 8.0 |  |  |  |
Non-current liability of hedging instrument |  |  |  | $ 9.0 |  |  |  |
Net gain/loss |  |  | $ (36.0) |  |  |  |  |
NDF | Fair value hedges | Minimum |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 208.70% | 208.70% |  |  |  |  |
NDF | Fair value hedges | Maximum |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 245.25% | 245.25% |  |  |  |  |
NDF | Fair value hedges | Weighted average |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 222.58% | 222.58% |  |  |  |  |
NDF | Maturing between February and April 2018 | Fair value hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 53.5 |  |
Average exchange rate | $ / item |  |  |  |  |  | 18.30 |  |
NDF | Maturing February 2017 | Fair value hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount, duration |  | $ 7.0 |  |  |  |  |  |
Net gain/loss |  |  | $ 2.0 |  |  |  |  |
NDF | Maturing between March and August 2018 | Fair value hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount |  | $ 6.3 |  |  |  |  |  |
Average exchange rate | $ / item |  | 18.94 |  | 18.94 |  |  |  |
NDF | Personal | Commercial commitments |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount, duration |  | $ 159.0 |  |  |  |  |  |
Net gain/loss |  |  | 2.0 |  |  |  |  |
NDF | Personal | Maturing March 2017 | Cash flow hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount, duration |  | $ 9.0 |  |  |  |  |  |
Current liability of hedging instrument |  |  |  | $ 2.0 |  |  |  |
Net gain/loss |  |  | (1.0) |  |  |  |  |
Deferred income/expense before income tax |  |  | (1.0) |  |  |  |  |
Other receivables | Fair value hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Receivables recognized |  |  |  | 59.0 |  |  |  |
Reserve of receivables in other comprehensive income |  |  |  | $ 6.0 |  |  |  |
Gains recognized from receivables |  |  | $ 53.0 |  |  |  |  |
2.1325% NDF | Fair value hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount | $ 20.0 |  |  |  |  |  |  |
Interest rate (as a percent) | 213.25% |  |  |  |  |  |  |
2.085% NDF | Fair value hedges |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount | $ 20.0 |  |  |  |  |  |  |
Interest rate (as a percent) | 208.50% |  |  |  |  |  |  |

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- Definition The amount of current loans and receivables. [Refer: Loans and receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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